The Collector Base part 2

Once the previous wave of enemies is killed, you should be able to climb or run your way over to the left side of this lengthy corridor, where the fifth lever sits. Once it's hit, you'll be attacked by another crew of enemies, who are again aggressive and heavy on Harbingers. You'll need to work your way through this wave and run towards the sixth lever in the distance. As you approach it, more Drones and Harbingers will show up, but ignore them while you go for the lever. Once you hit it, Tali will again find some temporary relief. You can then seek cover and fire on the Drones and Harbingers that have collected nearby. The cover near the sixth lever is ample, so you should be fine in killing this entire wave of enemies, even if you let them collect into greater numbers than you might be comfortable with while chasing that sixth switch.

As you round the corner heading leftward from the sixth lever, you'll run into a few Collector Drones. You can easily get the jump on them and kill them in one big, bullet-littered group rather easily, collecting their dropped ammunition once all is said and done. When you look rightward from there, however, you'll find that you're in for a bit of a fight. Take cover and begin to work on whittling down the heavy numbers of Collector Drones that are landing in the area. You'll also come under attack from several more Harbingers, and even another type of Collector enemy, the hard-hitting Assassin. You'll have quite an expansive space in which to fight here, which means that your sniper rifle will be extra useful to you in dealing with far-off threats. You've no doubt taken notice of the seventh switch ahead on your left. When the coast is clear, quickly run up to it and strike it, to give Tali more time and space in which to move. Now, there's only one more switch left before Tali is, presumably, home free.

That switch is directly in front of you, but before you get there, you're going to have to deal with any residual enemies that are swarming around you, likely ahead and to your right. You can actually book it towards the eighth and final lever, activating it while on the run. Doing so will catalyze a lengthy cutscene and allow you to begin the next part of the mission without too much trouble. However, doing this can be suicidal as well, especially if Harbingers and Assassins have you in their sights. The conditions around you in your particular playthrough are most important, so assess what's going on around you, and make your decision accordingly. There are really only two options to consider -- either going straight after the switch without dealing with the remaining enemies, or thinning out the enemy ranks first to make things safer before going for that eighth switch. Remember that we don't have too much time to decide, as Tali is frying alive in the shafts above.

Once you've hit the final lever, a series of lengthy cutscenes will take place, in three primary waves. The first cutscene will show Shepard and his party hitting the eighth lever and then running through a nearby door and into a sealed room. Tali (or whoever your tech specialist was) will be working frantically to get the door sealed shut, so that no Collectors can follow you from the way you came. It seems that some gamers will have different outcomes depending on who they chose as their tech specialist, since if you chose someone other than Tali, including tech-savvy Mordin, they will die while trying to seal the door. Tali should survive the onslaught, however, which is precisely what happened to us. Once this first of three cutscenes concludes, you'll be thrust into the second cutscene, where a grisly discovery is uncovered.